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Response对象通过字节流输出中文内容：

Response对象生成随机验证码ResponseDemo3.java文件： package com.neu;import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.IOException; impo

ResponseDemo4.java文件：package com.neu;import java.io.IOException;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServ

ResponseDemo5.java文件：package com.neu;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax

ResponseDemo6.java文件：package com.neu;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.